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Finding the Fourth Proportional to 163,915.70, 245,881.65 and 85,183.70

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Solution

The fourth proportional to 163,915.70, 245,881.65 and 85,183.70 is: 127,779.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    163,915.70 : 245,881.65 = 85,183.70 : x
  2. Step 2: Convert to fraction form
    163,915.70/245,881.65 = 85,183.70/x
  3. Step 3: Cross multiply
    163,915.70x = 245,881.65 × 85,183.70
  4. Step 4: Simplify right side
    163,915.70x = 20,945,108,709.11
  5. Step 5: Solve for x
    x = 20,945,108,709.11/163,915.70
  6. Step 6: Final answer
    x = 127,779.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.